00355nam a2200109Ia 4500008004100000040001100041100002100052245008400073260006100157300001700218300001000235251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aMurrie W. Burgen 0aProceedings of the National Academy Of Sciences of the United States of America  cSeptember, 1973bThe National Academy of SciencesaU.S.A  aP. 2473-3943  bV. 70